Mechanical rabble for ore roasting or calcining furnaces



No. 750,194. PATENTED JANJQ, 1994.

' -A. E. JOHNSON.

MECHANICAL RABBLE FUR ORE ROASTING OR CALGINING FURNACES.

APPLICATION FILED FEB. 16. 1903.

N0 MODEL.

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UNITED STATES Patented January 19, 1904.

PATENT OFFI E.

MECHANICAL RABBLE FOR ORE ROASTING OR CALCINING FURNACES.

SPECIFICATION forming part of Letters Patent No. 750,194, dated January 19, 1904.

Application filed February 16, 1903. Serial No. 143,719. (No model.)

' To all whom it may concern:

. Be it known that I, ALFRED E. JOHNSON, a citizen of the United States of America, residing at Colorado Springs, in the county of El Paso and State of Colorado, have invented certain new and useful Improvements in Mechanical Rabbles for Ore Roasting or Calcining Furnaces; and Ido declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification. I

My invention relates to improvements in rabble mechanism or mechanical devices for stirring the ore whereby fresh surfaces are exposed to the action of the heat simultaneously with the gradual advancement of the ore over the hearth in the direction of the rabbles travel. This improvement relates more especially to the construction whereby the rabble-blades are attached to the arms which extend transverselyacross the longitudinal hearth of the furnace, whereby the said blades or plows are readily detachable and whereby the use of nuts and bolts or other similar fastening devices ordinarily employed in connecting the plows or blades with the arms. is obviated. The ordinary fastening means are objectionable owing to the fact that the degree of heat required for roasting purposes in order to remove the elements which render the ore refractorysuch as sulfur, arsenic, &c.burns or corrodes the parts, making it difiicult to remove the nuts and bolts when it becomes necessary to remove the blades or plows, as is frequently-required in repairing the rabble mechanism. In my improvedconstruction the blades or plows are loosely mounted-on the rabble-arms and may be lifted off or disconnected at pleasure, and the arrangement is such that during the oper ation of the rabbles in the performance of their regular function in the furnace the blades are held tightly in place, since the resistance offered by the bed of ore upon the hearth causes the blades to tightly hug or press the rabble-arms, and the greater the resistance the more tightly are the blades held in place on the arms. As shown in the drawings, threaded openings are formed in the top of the hollow rabble-arm, into which openings are screwed studs, lugs, or projections, whose outer extremities protrude sufliciently to allow the rabble blades or plows. to be hung upon the arms, the blades being provided with suitable openings for the purpose and having their upper portions curved or otherwise shaped to' fit the rabble-arm on the side toward the direction oftravel.

Having outlined my improved construction in a general way, I will proceed to describe the same in detail, reference being made to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a fragmentary front view of a hollow rabble-arm, showing two blades or plows in place. Fig. 2 is an end elevation of the same. Fig. 3 is a crosssection taken through the rabble-arm on the line 3 3, the blade being shown partly in secties are provided with openings 7 a somewhat larger than the studs to permit the latter to be connected and disconnected at will and in' a manner that will be readily understood by reference to Fig. 3. The upper portion of each rabble-blade is curved, as shown at 7, to fit the arm 5 on the side toward the direction of travel, as best illustrated in Fig. 2,

struction of rabble blade or plow may be employed without departing from the spirit of the invention. This may also be said of the rabble-arm.

Having thus described my invention, what I claim is 1. The combination with a rabble-arm, of a plow or blade loosely mounted thereon and extending downwardly on the side of the arm toward the direction of travel.

2. The combination with a rabble-arm provided with lugs or projections on its upper side when in the operative position, and rabble arms or plows having openings to permit them to be hung upon the lugs of the arms whereby the blades are readily detachable.

3. The combination with a suitable rabblearm, of a blade or plow loosely connected therewith and whose upper portion is shaped to conform to the shape of the arm in front or on the side toward thedirection of travel whereby the resistance acting on the lower part of the blade, causes the latter to tightly engage the arm.

4:. In rabbling mechanism for roasting or calcining furnaces, the combination of the rabble-arm, blades loosely connected with the arm at the top and shaped to fit the arm in front, substantially as described.

5. The combination of a rabble-arm provided with detachable lugs or projections, and rabble-arms hung loosely thereon.

6. The combination of a rabble-arm having protruding studs at the top and blades or plows having their upper extremities provided with openings to receive the studs of the arm, whereby the blades may be loosely hung thereon, readily detachable and held securely in place when in operation.

7 The combination of a tubular rabblearm, screw-studs threaded therein at the top at suitable intervals and protruding therefrom, and rabble blades or plows having openings in their upper extremities and having their upper portion curved to conform to the shape of the arm whereby the blades may be loosely hung on the arm, and held securely in place during operation but readily detachable.

8. A rabble-arm, provided with plow-teeth, loosely and liftably suspended therefrom.

9. A rabble-arm, provided with plow-teeth, loosely and liftably suspended therefrom, by a slotrand-pin connection.

10. A rabble arm, provided with plowteeth having a limited play with respect to the arm, whereby they maybe moved respectively into locking and unlocked position.

11. A rabble-arm, provided with pins along its upper side, in combination with teeth having slots engaging the pins, the teeth being freely suspended from the pins.

In testimony whereof I affix my signature in presence of two witnesses.

ALFRED E. JOHNSON. 

